$H {N O}_{2}$ acts as an oxidant with which one of the following reagent:

K M n O_{4}

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H_{2} S

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K_{2} {C r}_{2} O_{7}

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{B r}_{2}

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Solution

The correct option is B $H_{2} S$
$H N O_{2}$ acts as both oxidising and reducing agent as the oxidation number of N in nitrous acid is +3, the oxidation number can be either increased or decreased.

Nitrous acid oxidises hydrogen sulphide to sulphur:

$H_{2} S + 2 H N O_{2} \to 2 H_{2} O + 2 N O + S$

whereas oxidation state increases when reacted with $K M n O_{4}, B r_{2}$ and nitrous acid acts as the reducing agent in this case.

Hence, the correct option is $B$

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